On Monday, August 12, 2013 09:45:52 AM Toshi Kani wrote: > CPU system maps are protected with reader/writer locks. The reader > lock, put_online_cpus(), assures that the maps are not updated while > holding the lock. The writer lock, cpu_hotplug_begin(), is used to > udpate the cpu maps along with cpu_maps_update_begin(). > > However, the ACPI processor handler updates the cpu maps without > holding the the writer lock. This patchset fixes this problem. > > --- > The patchset is based on linux-next of the pm tree. Basically looks OK to me, but I'd just merge the patches together, because the [2/2] is the very reason for the change made by [1/2]. Also it would be good to mention the actual scenario that may lead to problems with that. Thanks, Rafael > --- > Toshi Kani (2): > CPU hotplug: Export cpu_hotplug_begin() interface > ACPI: Acquire writer lock to update cpu maps > > --- > drivers/acpi/acpi_processor.c | 21 ++++++++++++++++----- > include/linux/cpu.h | 2 ++ > kernel/cpu.c | 4 ++-- > 3 files changed, 20 insertions(+), 7 deletions(-) > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
